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Investigation of the efficiency of spin-orbit torque induced magnetization switching in Functional oxide/ ferromagnetic stack films for a new In-memory computing

Research Project

Project/Area Number 21K14522
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionTohoku University

Principal Investigator

Nguyen Thi Van Anh  東北大学, 先端スピントロニクス研究開発センター, 助教 (20840101)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
KeywordsSpin orbit torque / Spin split effect / Spin Hall effect / Antiferromagnetic / SOT-MRAM / RuO2 / Functional oxides / RuO2/FM bilayer / spin-split effect / magnetization switching / functional oxides / spintronics / magnetization dynamics / antiferromagnetic / Hall measurement / ferromagnetic resonance / Spin-orbit torque / voltage-assisted SOT
Outline of Research at the Start

This proposal focuses on the investigation of the efficiency of spin-orbit torque (SOT) induced magnetization switching in Functional oxide/ferromagnetic stacks by showing: (1) high SOT efficiency under the influence of crystallinity; and (2) SOT efficiency under the assistance of electric field.

Outline of Final Research Achievements

In this study, spin-orbit torque (SOT) induced magnetization switching in Functional oxide/ ferromagnetic (FO/FM) stack films has been investigated with the realization of new functionality towards the novel spintronic devices application.
The RuO2 thin film was fabricated with well-controlled crystallinity, surface, and resistivity. The spin current was generated in the RuO2 thin film with well-understood polarity, which was then used to induce the magnetization switching of the FM layer placing adjacent to the RuO2 layer. The effective SOT fields in RuO2/FM stack film have been investigated using harmonic Hall measurement and the origin for these SOT fields was attributed mainly to the spin-split effect by considering the spin Hall conductivity tensor under the symmetry analysis for the RuO2 crystal structure. This research is important for the further research on the current-induced magnetization switching using functional oxides.

Academic Significance and Societal Importance of the Research Achievements

This research fulfilled the lack of investigation of the SOT-induced magnetization switching under the spin-split origin in RuO2/FM bilayer by a well-controlled crystallinity of RuO2 and a thoughtful combination of experiment and calculation. This also open a new switching mechanism for SOT devices.

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (12 results)

All 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Effect of oxygen incorporation on dynamic magnetic properties in Ta-O/Co-Fe-B bilayer films under out-of-plane and in-plane magnetic fields2022

    • Author(s)
      Nguyen T. V. A.、Saito Y.、Naganuma H.、Ikeda S.、Endoh T.、Endo Y.
    • Journal Title

      AIP Advances

      Volume: 12 Issue: 3 Pages: 035133-035133

    • DOI

      10.1063/9.0000297

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Dependence of dynamic magnetic properties on the Co-Fe-B layer thickness for Ta/Co-Fe-B and Ta-O/Co-Fe-B bilayers2022

    • Author(s)
      T. V. A. Nguyen, Y. Saito, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      The 69th JSAP Spring Meeting 2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] Preparation and spin-orbit torque measurement of RuO2/Co-Fe-B bilayer2022

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      The 83rd JSAP Autumn Meeting, 2023; Tohoku Univ. & Online
    • Related Report
      2022 Annual Research Report
  • [Presentation] Spin-orbit torques in RuO2/Co-Fe-B bilayer2022

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      2022 MMM conference; Minneapolis, Minnesota, USA
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-orbit torque measurement of RuO2/Co-Fe-B bilayer2022

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      令和4年度スピニクス特別研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Fabrication of RuO2 thin film for spin orbit torque induced magnetization switching2022

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      6th International Symposium on Frontiers in Materials Science
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dependence of dynamic magnetic properties on the Co-Fe-B layer thickness for Ta/Co-Fe-B and Ta-O/Co-Fe-B bilayers2022

    • Author(s)
      T. V. A. Nguyen, Y. Saito, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      The 69th JSAP Spring Meeting 2021
    • Related Report
      2021 Research-status Report
  • [Presentation] Study on the current distribution in Ta-O/Co-Fe-B stack films with the presence of interfacial scattering2021

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, K. V. De Zoysa, S. Fukami, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      令和3年度スピニクス特別研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Effect of surface treatment on damping constant in Ta-O/Co-Fe-B heterostructures2021

    • Author(s)
      T. V. A. Nguyen, Y. Saito, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      2022 Joint MMM - Intermag conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Evaluation of resistivity in Ta-O/Co-Fe-B multilayers with the presence of interfacial scattering2021

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, K. V. De Zoysa, S. Fukami, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      The 82nd JSAP Autumn Meeting, 2021;
    • Related Report
      2021 Research-status Report
  • [Presentation] Spin-orbit torque in naturally oxidized Ta-O/Co-Fe-B/Mg-O/Ta structures2021

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, K. V. De Zoysa, S. Fukami, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      IEEE International Magnetics Conference, 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Investigation of spin-orbit torque induced magnetization switching in Ta-O/Co-Fe-B heterostructures2021

    • Author(s)
      T. V. A. Nguyen, S. DuttaGupta, Y. Saito, K. V. De Zoysa, S. Fukami, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      The 68th JSAP Spring Meeting 2021
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2024-01-30  

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